Remanufactured Honda R18 Civic 1.8L Cylinder Head Casting # RNA

Remanufactured Honda Civic 1.8L R18A1 Cylinder Head Casting # RNA (2006–2011)

Premium OEM Replacement Cylinder Head For Honda 1.8L R18 Engines

This remanufactured Honda Civic 1.8L R18A1 SOHC cylinder head is precision-machined to restore original factory performance and fuel efficiency. Specifically designed for 2006–2011 models, this head features integrated VTEC (VVTi) technology to ensure a direct fit and long-lasting durability. Each unit is thoroughly inspected and refurbished to meet or exceed OEM specifications for reliable daily operation.

🛠️ In-House Machining Process

• Cleaning: Fully disassembled and thermally cleaned.
• Soda Blasted: Castings are blasted with Sodium Bicarbonate. Because baking soda is water-soluble, there is zero risk of abrasive media clogging oil passages.
• Pressure Testing: Tested to 60 PSI to ensure no cracks or porosity leaks.
• Surfacing: All heads are resurfaced on our Rottler S85A for a precision gasket-sealing surface.
• Valve Job: Multi-angle valve job performed; every port is Vacuum Tested to ensure valves are seated 100% airtight.

📊 Technical Specifications

• Engine Size: 1.8L
• Engine Code: R18A1
• Casting Number: RNA
• Configuration: SOHC (Single Over Head Cam) 4-Cylinder
• Condition: Remanufactured
• Technology: VTEC / VVTi Equipped
• Included Components: Valves and springs (Head Gasket and Bolts not included)
• Interchangeable Part Numbers:
  • 10003-RNA-A00 ASSM
  • 10003-RNA-A01 ASSM
• Core Return Required

🚛 Fitment Data

Common Applications:

• Honda Civic: 2006–2011 Honda Civic (1.8L)